The Avengers #173

The dramatic tagline "…And Then There Were None!" sets a tense tone for this 1978 Marvel chapter, with cover art by George Pérez (pencils) and Terry Austin (inks) showcasing a gripping scene of Black Widow, a bearded fighter in orange and green, and a blue-and-yellow costumed figure caught in a crackling black energy field — all three appear to be struggling against some unseen force. Iron Man and Hawkeye stand watch on the left, while the Wasp looks on anxiously from the right, as Vision peers down from the corner — suggesting that Earth's Mightiest Heroes are facing a threat that may be whittling their ranks down one by one.